X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=hv.h;h=5bc38a0a79ae8c02c81136cc611276c8e68f16fc;hb=fce230d754ec6ae18a0b1289155fa97e3b459bbc;hp=11a602c1b75e8efb12e06c686d6d0b10307e42e5;hpb=d18c61170a30691556a1da7413e13241a92f4e0a;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/hv.h b/hv.h
index 11a602c..5bc38a0 100644
--- a/hv.h
+++ b/hv.h
@@ -1,6 +1,6 @@
 /*    hv.h
  *
- *    Copyright (c) 1991-1999, Larry Wall
+ *    Copyright (c) 1991-2000, Larry Wall
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
@@ -48,6 +48,62 @@ struct xpvhv {
 	(hash) = hash_PeRlHaSh + (hash_PeRlHaSh>>5); \
     } STMT_END
 
+/*
+=for apidoc AmU||HEf_SVKEY
+This flag, used in the length slot of hash entries and magic structures,
+specifies the structure contains a C<SV*> pointer where a C<char*> pointer
+is to be expected. (For information only--not to be used).
+
+=for apidoc AmU||Nullhv
+Null HV pointer.
+
+=for apidoc Am|char*|HvNAME|HV* stash
+Returns the package name of a stash.  See C<SvSTASH>, C<CvSTASH>.
+
+=for apidoc Am|void*|HeKEY|HE* he
+Returns the actual pointer stored in the key slot of the hash entry. The
+pointer may be either C<char*> or C<SV*>, depending on the value of
+C<HeKLEN()>.  Can be assigned to.  The C<HePV()> or C<HeSVKEY()> macros are
+usually preferable for finding the value of a key.
+
+=for apidoc Am|STRLEN|HeKLEN|HE* he
+If this is negative, and amounts to C<HEf_SVKEY>, it indicates the entry
+holds an C<SV*> key.  Otherwise, holds the actual length of the key.  Can
+be assigned to. The C<HePV()> macro is usually preferable for finding key
+lengths.
+
+=for apidoc Am|SV*|HeVAL|HE* he
+Returns the value slot (type C<SV*>) stored in the hash entry.
+
+=for apidoc Am|U32|HeHASH|HE* he
+Returns the computed hash stored in the hash entry.
+
+=for apidoc Am|char*|HePV|HE* he|STRLEN len
+Returns the key slot of the hash entry as a C<char*> value, doing any
+necessary dereferencing of possibly C<SV*> keys.  The length of the string
+is placed in C<len> (this is a macro, so do I<not> use C<&len>).  If you do
+not care about what the length of the key is, you may use the global
+variable C<PL_na>, though this is rather less efficient than using a local
+variable.  Remember though, that hash keys in perl are free to contain
+embedded nulls, so using C<strlen()> or similar is not a good way to find
+the length of hash keys. This is very similar to the C<SvPV()> macro
+described elsewhere in this document.
+
+=for apidoc Am|SV*|HeSVKEY|HE* he
+Returns the key as an C<SV*>, or C<Nullsv> if the hash entry does not
+contain an C<SV*> key.
+
+=for apidoc Am|SV*|HeSVKEY_force|HE* he
+Returns the key as an C<SV*>.  Will create and return a temporary mortal
+C<SV*> if the hash entry contains only a C<char*> key.
+
+=for apidoc Am|SV*|HeSVKEY_set|HE* he|SV* sv
+Sets the key to a given C<SV*>, taking care to set the appropriate flags to
+indicate the presence of an C<SV*> key, and returns the same
+C<SV*>.
+
+=cut
+*/
 
 /* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */
 #define HEf_SVKEY	-2	/* hent_key is a SV* */